He is not just "a guy".Not surprised that a first iteration of a new feature has room for improvement. There's nothing magical about the Apple process for doing this. Colorimeters have been used for monitor adjustment for years by photographers. I use one. The phone in the case of the Apple TV is just running a simple routine to try to improve color balance. The feature will improve over time. I love this notion that any and all new features must be released with absolute perfection otherwise they will be declared an utter failure. And, honestly, a guy that makes his living overcharging for monitor calibration is never, ever going to say anything positive about a feature like this no matter who it is from.
He's not biased.